The governments of Europe no longer hold a monopoly of violence. Terror groups and MENAPT groups have brought a diverse range of violent threats to people.
Building a robot army to solve this is one viable solution that is hardware and software based.
It's the same reason we don't seek to improve crime rates by legalising theft. Sure, there'd be fewer people labelled as "criminal", but the original problem would remain (and in all probability would become worse).
Obviously, it is the reason that matters and the reason is not benign.
People want other people to like people in certain way they and then castrate Alan Turing for illegal love. People want to have slaves then they have illegally free slaves problem.
Why pretend that this is about upholding the law?